networking question
Consider transmitting a packet from host A to host B via a router, as shown below:
Suppose that before sending the packet, all the ARP tables (in the two hosts and in the router) are empty. Assuming host A knows the IP address of host B, describe all the packets exchanged before sending the packet to B.
Homework Answers
Since all the ARP tables are empty, so host A will send a packet to router to know the mac address of host B. Since the ARP table of router is also empty, so router will send a packet to host B requesting for the mac address corresponding to the IP address of host B.
Thereafter host B reply with by sending packet to the router containing its mac address.
The mac address returned by host B will be send to host A from the router.
Hence there are total 4 packets exchanged before sending the packet to B, first is ARP request packet from host A to router, then ARP request from router to host B, then reply from host B to router, then reply from router to host A. Then the packet from host A will be send to host B.
Please comment for any clarification.
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